[mdturnerphys]

Response from my friend:

Novel thought...

Theoretically, yes. The Environmental Control Systems on all our commercial airplanes positively charge the airflow at a nominal Delta P of 9.8 psi and have HEPA filtration down to 10µm, but at $100M+ per 737 MAX, delivery customers highly frowning upon such a practice and not being able to deliver them as a "New" airplanes after contamination, highly unlikely.

The A380 fleet is starting to retire prematurely only after 10 short years of service due to lack of profitability and demand due to COVID-19. Those huge retired Behemoths could serve very well as a quarantine base in remote locations.